free field guide
Why you wake up tired
Four testable levers behind unrefreshing sleep, each with the dose, the 2-week test and the one signal to track.
Get the one-pager
The four levers on one page, plus how to run the first test without overhauling your life. No spam. The guide, then the occasional useful thing. Unsubscribe anytime.
You're in. Here's the guide.
Check your inbox for a copy too. The short version: when sleep stops restoring you, the usual suspects are timing, light, temperature and late caffeine, and each one is testable inside 2 weeks.
- Same wake time, every day. Pick one time and hold it for a week, weekends included. In a 60,000-person UK Biobank analysis, regular sleep timing predicted long-term mortality risk better than sleep duration did. Signal: rate your first 30 minutes awake, 1 to 5.
- Ten minutes outside, before the phone. Outdoor morning light runs 20x to 1000x brighter than a lit room, and window glass filters the useful part, so indoors barely counts. It sets your clock better than coffee does. Signal: when the afternoon slump hits, and how hard.
- A cooler room than feels normal. Guidance for adults clusters around 60 to 67F, with 65F a sensible default, because the drop in core temperature helps deep sleep start and hold. The right number is personal, so move yours a couple of degrees and watch what happens. Signal: night wakings, and how heavy the alarm feels.
- Caffeine off, 8 hours out. Caffeine about 6 hours before bed cuts deep sleep by roughly 20 to 30 percent even when you fall asleep fine, and its half-life runs 5 to 7 hours. Signal: wake-up grogginess after 4 or 5 days.
How to run it. Pick the lever that costs you least, run it for a week or two, then add the next. One at a time keeps the signal readable. Small wins compound.
What's on the page
Four levers, each with the dose, the common mistake and the one signal that says keep or drop. Boring on purpose, and it works.
- Same wake time
- Morning light, outside
- The cool room
- The caffeine cutoff
- The 2-week test format
- One signal to track
Want the full system?
The one-pager runs the method on one problem. Build Your Own n=1 System teaches you to build and test protocols like it for any goal across sleep, energy and strength, so you know what works on you, not on an influencer. $27, instant download.
See Build Your Own n=1 System →